Laurent Pointal <[EMAIL PROTECTED]> wrote: > billiejoex a écrit : > > Hi, > > I'm writing a small asyncore-based server application serving a lot of > > clients. When I have to handle more than 1021 client simoultaneously > > the 'binded' socket object raises an error: > > > > [...] > > connections: 1018 > > connections: 1019 > > connections: 1020 > > connections: 1021 > > Traceback (most recent call last): > > File "asyncore_client.py", line 31, in <module> > > File "asyncore.py", line 191, in loop > > File "asyncore.py", line 138, in poll > > File "asyncore.py", line 80, in write > > File "asyncore.py", line 76, in write > > File "asyncore.py", line 395, in handle_write_event > > File "asyncore_client.py", line 24, in handle_connect > > File "asyncore_client.py", line 9, in __init__ > > File "asyncore.py", line 257, in create_socket > > File "socket.py", line 156, in __init__ > > socket.error: (24, 'Too many open files') > > > > I just wanna know: is there a way to know how many connections can > > accept a 'binded' socket BEFORE getting such error? Maybe > > socket.SOMAXCONN could help me? > > Here you get out of file descriptors, I dont think SOMAXCONN would help. > > Under Linux (maybe Unix), there is ulimit -n nnn to setup the maximum > number of files descriptors. I don't know its upper limit (maybe a > kernel compile time information).
A shell command ulimit -Hn should report on the hard-limit of the number of open file descriptors; just ulimit -n should report on the current soft-limit. If you're going to pass the fd's to select, as asyncore does by default, a separate limit of 1024 is unfortunately likely to apply anyway; so, once that ulimit is raised, you may want to pass argument use_poll as true to asyncore.loop. The performance of poll with a huge number of sockets may however not be all that shiny. Better mechanisms, such as epoll or kqueue, I believe, are not available for asyncore, even if your OS supports them; to serve thousands of open sockets with good performance, you may need to switch to Twisted (which offers many more implementations of the abstract Reactor interface -- you don't _have_ to use Twisted's higher layers if you don't want to). Alex -- http://mail.python.org/mailman/listinfo/python-list
